Question

which substance present in the glass​

Answer 1

Answer:

Photochromatic glasses are generally made up of glass containing small crystals of silver halides like (AgBr) that darkens when exposed to light.

Answer 2

Answer:

There is no single chemical composition that characterizes all glass. Typical glass contains formers, fluxes, and stabilizers. Formers make up the largest percentage of the mixture to be melted. In typical soda-lime-silica glass the former is silica (Silicon dioxide) in the form of sand